CN203754313U - Anti-back-tipping device and swing arm tower crane with same - Google Patents
Anti-back-tipping device and swing arm tower crane with same Download PDFInfo
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- CN203754313U CN203754313U CN201420158315.4U CN201420158315U CN203754313U CN 203754313 U CN203754313 U CN 203754313U CN 201420158315 U CN201420158315 U CN 201420158315U CN 203754313 U CN203754313 U CN 203754313U
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- squat system
- pressure valve
- oil cylinder
- oil
- hypsokinesis
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- 238000013016 damping Methods 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims description 39
- 239000002828 fuel tank Substances 0.000 claims description 20
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 9
- 230000002411 adverse Effects 0.000 abstract description 5
- 239000003921 oil Substances 0.000 description 92
- 235000019198 oils Nutrition 0.000 description 92
- 239000010720 hydraulic oil Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 3
- 230000009194 climbing Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 235000015112 vegetable and seed oil Nutrition 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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Abstract
The utility model discloses an anti-back-tipping device comprising an anti-back-tipping oil cylinder, an oil tank, a first oil way and a second oil way, wherein the first oil way is connected between a rodless cavity of the anti-back-tipping oil cylinder and the oil tank; the second oil way is connected between a rod cavity of the anti-back-tipping oil cylinder and the oil tank; the anti-back-tipping device also comprises an electro-hydraulic proportional pressure valve, a damping element and a control unit; the electro-hydraulic proportional pressure valve and the damping element are connected to the first oil way in series; the damping element is arranged between the electro-hydraulic proportional pressure valve and the anti-back-tipping oil cylinder; the control unit is electrically connected to the electro-hydraulic proportional pressure valve. The utility model also relates to a swing arm tower crane with the anti-back-tipping device. Anti-back-tipping force provided by the anti-back-tipping device has the relatively flexibility, relatively small in local adverse effects on a cantilever crane, the anti-back-tipping device is simple in structure, convenient and fast to maintain, and easy to popularize and use, and adopts a remote control mode.
Description
Technical field
The utility model relates to elevator machinery field, relates in particular to a kind of anti-squat system and has this anti-squat system movable arm tower crane.
Background technology
At present, the anti-squat system of movable arm tower crane mainly contains two kinds of mechanical spring formula and hydraulic controlling types.
Mechanical spring formula anti-squat system is generally applied to little tonnage tower machine, its principle is Compress Spring while utilizing arm frame of tower crane to contact with Compress Spring, and the elastic potential energy being directly proportional to spring displacement that Compress Spring produces provides bounce as hypsokinesis bearing force for arm frame of tower crane, to prevent arm frame of tower crane hypsokinesis.At present, large-tonnage tower machine also has the mechanical spring of employing formula anti-squat system, but, the hypsokinesis bearing force required due to large-tonnage tower machine is larger, while adopting mechanical spring formula anti-squat system, the rigidity of required spring is also larger, rigidly connect while touching and can produce larger rigid impact at arm frame of tower crane and mechanical spring formula anti-squat system, affect the main chord of arm frame of tower crane.
Hydraulic controlling type anti-squat system is generally the hypsokinesis bearing force that the corresponding control cock output stage by controlling hydraulic efficiency pressure system changes, and compared with mechanical spring formula anti-squat system, the hypsokinesis bearing force controllability that hydraulic controlling type anti-squat system provides is strong.But, hydraulic controlling type anti-squat system system complex, inspection and maintenance difficulty, and in the time of test adjustment, needs the enterprising traveling control valve of the tower machine of climbing to frequently and the parameter adjustment of sensor, and aloft work is very dangerous.Therefore, hydraulic controlling type anti-squat system is subject to certain limitation applying of movable arm tower crane.
In addition, anti-squat system on existing movable arm tower crane only can work in the time that arm frame of tower crane wide-angle lifts, and have suddenly the state (particularly in the time that wind direction blows to equilibrium arm from crane arm) of strong wind and the state of tower machine wide-angle jacking for arm frame of tower crane wide-angle under off working state, anti-squat system on existing movable arm tower crane can not play a role by actv., therefore movable arm tower crane still has the danger that hypsokinesis occurs under this two states, has potential safety hazard.
Utility model content
The purpose of this utility model is, a kind of anti-squat system is provided, and it provides goes all out to have more flexibility after anti-, less to the local adverse effect of jib, and simple in structure, adopts Long-distance Control mode, and it is convenient to safeguard, is easy to promote the use of.
Another object of the present utility model is, a kind of movable arm tower crane with this anti-squat system is provided, and its anti-squat system provides goes all out to have more flexibility after anti-, local adverse effect to jib is less, adopt Long-distance Control mode, it is convenient to safeguard, is easy to promote the use of.
It is to adopt following technical scheme to realize that the utility model solves its technical matters.
A kind of anti-squat system, it comprises anti-hypsokinesis oil cylinder, fuel tank, the first oil circuit and the second oil circuit.The first oil circuit is connected between the rodless cavity and fuel tank of anti-hypsokinesis oil cylinder.The second oil circuit is connected between the rod chamber and fuel tank of anti-hypsokinesis oil cylinder.Anti-squat system also comprises electro liquid proportion pressure valve, damping element and control unit.Electro liquid proportion pressure valve is connected with damping element and is located at the first oil circuit, and damping element is between electro liquid proportion pressure valve and anti-hypsokinesis oil cylinder.Control unit is electrically connected on electro liquid proportion pressure valve.
In the utility model preferred embodiment, above-mentioned anti-squat system also comprises check valve, above-mentioned the first oil circuit comprises the first branch road and the second branch road in parallel, the first branch road is provided with electro liquid proportion pressure valve and damping element, the second branch road is provided with check valve, the oil inlet port of check valve is communicated with fuel tank, and the oil outlet of check valve is communicated with anti-hypsokinesis oil cylinder.
In the utility model preferred embodiment, above-mentioned anti-squat system also comprises power amplifier, and power amplifier is connected between control unit and electro liquid proportion pressure valve.
In the utility model preferred embodiment, above-mentioned anti-squat system also comprises the first shutoff valve and the second shutoff valve, and the first shutoff valve is located at the first oil circuit, and between electro liquid proportion pressure valve and anti-hypsokinesis oil cylinder, the second shutoff valve is located at the second oil circuit.
In the utility model preferred embodiment, above-mentioned the first oil circuit is also provided with compression indicator.
In the utility model preferred embodiment, in the rodless cavity of above-mentioned anti-hypsokinesis oil cylinder, be provided with spring.
In the utility model preferred embodiment, above-mentioned control unit is continuous arrival current curve to the input current value of electro liquid proportion pressure valve input.
In the utility model preferred embodiment, above-mentioned control unit is the current value of setting to the input current value of electro liquid proportion pressure valve input.
A kind of movable arm tower crane, comprises above-mentioned anti-squat system.
The beneficial effects of the utility model are, the anti-squat system of the present embodiment and the movable arm tower crane with this anti-squat system, be connected in the first oil circuit between the rodless cavity of anti-hypsokinesis oil cylinder and fuel tank and be provided with solenoid-operated proportional pressure valve, and control unit is electrically connected on electro liquid proportion pressure valve, control unit can be arranged at the break-make pressure of controlling electro liquid proportion pressure valve in control cabin and do continuous dynamic change with the input current value of drafting, thereby the hydraulic oil rigidity of anti-squat system is changed according to certain rules, make to go all out to have more flexibility after anti-squat system anti-, local adverse effect to jib is less, simple in structure, be conducive to realize Long-distance Control, it is convenient to safeguard, be easy to promote the use of.
For making advantage of the present utility model clearer, below in conjunction with accompanying drawing, the utility model embodiment is further described.
Brief description of the drawings
Fig. 1 is the hydraulic efficiency pressure system schematic diagram of the anti-squat system of the movable arm tower crane of an embodiment of the present utility model.
Fig. 2 is the movable arm tower crane structural representation of an embodiment of the present utility model.
Fig. 3 is that the movable arm tower crane off working state of an embodiment of the present utility model is met schematic diagram when strong wind.
Schematic diagram when Fig. 4 is the movable arm tower crane jacking state of an embodiment of the present utility model.
Fig. 5 be the movable arm tower crane of an embodiment of the present utility model anti-hypsokinesis oil cylinder piston rod movement stroke with anti-after the graph of a relation of going all out.
Detailed description of the invention
Technological means and effect of taking for reaching predetermined object for further setting forth the utility model, below in conjunction with accompanying drawing and preferred embodiment, to according to the anti-squat system that the utility model proposes with there is detailed description of the invention, structure, feature and effect thereof of the movable arm tower crane of this anti-squat system, be described in detail as follows.
Relevant aforementioned and other technology contents of the present utility model, Characteristic can be known and present in the detailed description of the following preferred embodiment that coordinates reference diagram.By the explanation of detailed description of the invention, when being able to more deeply and concrete understanding for technological means and effect of reaching predetermined object and taking the utility model, but institute's accompanying drawing be only to provide with reference to the use of explanation, be not used for the utility model to be limited.
Fig. 1 is the hydraulic efficiency pressure system schematic diagram of the anti-squat system of the movable arm tower crane of an embodiment of the present utility model.Fig. 2 is the movable arm tower crane structural representation of an embodiment of the present utility model.Refer to Fig. 1 and Fig. 2, movable arm tower crane 10 comprises A cabinet frame 401 and is arranged at the anti-squat system 100 of A cabinet frame 401.Anti-squat system 100 comprises anti-hypsokinesis oil cylinder 110, fuel tank 120, the first oil circuit 130, the second oil circuit 140, electro liquid proportion pressure valve 131 and control unit 300.In the present embodiment, it is two anti-hypsokinesis oil cylinders 110 that Fig. 1 illustrates, but not as limit, in other embodiments, can be also an anti-hypsokinesis oil cylinder 110 or plural anti-hypsokinesis oil cylinder 110.The first oil circuit 130 is connected between the rodless cavity 110a and fuel tank 120 of anti-hypsokinesis oil cylinder 110, for controlling the pressure of hydraulic oil of rodless cavity 110a of anti-hypsokinesis oil cylinder 110.The first oil circuit 130 is connected to corresponding anti-hypsokinesis oil cylinder 110 according to the quantity of anti-hypsokinesis oil cylinder 110 being connected to the seed oil road that is divided into respective amount before anti-hypsokinesis oil cylinder 110.In the present embodiment, the first oil circuit 130 is being connected to the rodless cavity 110a that is divided into two strip oil circuits before two anti-hypsokinesis oil cylinders 110 and is connected respectively to two anti-hypsokinesis oil cylinders 110.The second oil circuit 140 is connected between the rod chamber 110b and fuel tank 120 of anti-hypsokinesis oil cylinder 110, inhales when empty directly from fuel tank 120 repairings for the rod chamber 110b of anti-hypsokinesis oil cylinder 110.The second oil circuit 140 is to be also connected to corresponding anti-hypsokinesis oil cylinder 110 according to the quantity of anti-hypsokinesis oil cylinder 110 being connected to the seed oil road that is divided into respective amount before anti-hypsokinesis oil cylinder 110.In the present embodiment, the second oil circuit 140 is being connected to the rod chamber 110b that is divided into two strip oil circuits before two anti-hypsokinesis oil cylinders 110 and is connected respectively to two anti-hypsokinesis oil cylinders 110.Control unit 300 is electrically connected on electro liquid proportion pressure valve 131, and control unit 300 comprises current input terminal, for controlling the input of electric current.
It is worth mentioning that, the control unit 300 of the anti-squat system 100 of the present embodiment is to be arranged in the operator's compartment of movable arm tower crane 10, and other element of anti-squat system 100 such as electro liquid proportion pressure valve 131, anti-hypsokinesis oil cylinder 110 etc. are the A cabinet frames 401 that is arranged at movable arm tower crane 10.Control unit 300 is electrically connected to electro liquid proportion pressure valve 131 by wire 302, has realized the Long-distance Control of electro liquid proportion pressure valve 131, thereby has realized the Long-distance Control of anti-squat system 100.
In the present embodiment, the first oil circuit 130 comprises the first branch road 130a and the second branch road 130b in parallel.The first branch road 130a of the first oil circuit 130 is provided with electro liquid proportion pressure valve 131.The first branch road 130a is also provided with the damping element 132 of connecting with electro liquid proportion pressure valve 131, and damping element 132 is for example damping hole, between electro liquid proportion pressure valve 131 and anti-hypsokinesis oil cylinder 110.The second branch road 130b of the first oil circuit 130 is provided with check valve 133, and the oil inlet port of check valve 133 is communicated with fuel tank 120, and oil outlet is communicated with anti-hypsokinesis oil cylinder 110, when empty for inhaling as the rodless cavity 110a of anti-hypsokinesis oil cylinder 110 directly from fuel tank 120 repairings.
In addition, the anti-squat system 100 of the present embodiment also comprises power amplifier 301, and power amplifier 301 is connected between the current input terminal of control unit 300 and the pilot control end of electro liquid proportion pressure valve 131.Power amplifier 301 is mainly used in amplifying the input current value I by the current input terminal input of control unit 300.Be understandable that, when the input current value I of the current input terminal input by control unit 300 is enough greatly time, power amplifier 301 also can omit setting.
In the present embodiment, be also provided with compression indicator 134 at the first oil circuit 130, but not as limit, in other embodiment, also can not arrange.Compression indicator 134 is the difference of pressure with the hydraulic oil near anti-hypsokinesis oil cylinder 110 ends for detection of close fuel tank 120 ends of the first oil circuit 130.Compression indicator 134 monitor the first oil circuit 130 pressure difference values for the hydraulic circuit that judges anti-squat system 100 whether in normal condition.
The first oil circuit 130 is also provided with the first shutoff valve 141a, the first shutoff valve 141a is located between electro liquid proportion pressure valve 131 and anti-hypsokinesis oil cylinder 110, in the present embodiment, the first shutoff valve 141a is located at the oil circuit after the two strip oil circuits that are connected with the rodless cavity 110a of two anti-hypsokinesis oil cylinders 110 merge.The second oil circuit 140 is provided with the second shutoff valve 141b, and in the present embodiment, the second shutoff valve 141b is located at the oil circuit after the two strip oil circuits that are connected with the rod chamber 110b of two anti-hypsokinesis oil cylinders 110 merge.
In addition, in the rodless cavity 110 of anti-hypsokinesis oil cylinder 110, be provided with spring 111, but not as limit, in other embodiment, also can not arrange.In the time that the hydraulic circuit of anti-squat system 100 breaks down; if the inside luffing of the jib of movable arm tower crane 10 402; the impulsive force of spring 111 energy buffer portions to anti-hypsokinesis oil cylinder 110; avoid the piston rod 112 of rod chamber 110b directly to impact the bottom of anti-hypsokinesis oil cylinder 110, play the effect of the anti-hypsokinesis oil cylinder 110 of protection.
To the principle of work of anti-squat system 100 of the present utility model be further described below.Anti-squat system 100 of the present utility model can be used for the multiple mode of operation of movable arm tower crane, the input current value I of various mode of operations can debug in advance in the debug phase, in the time that movable arm tower crane 10 drops into normal use, for input current value I corresponding to the different operating condition selecting of movable arm tower crane 10.
1, when mode of operation
The input current value I being inputted by the current input terminal of control unit 300 is a kind of electric current input curve of drafting in advance.The break-make pressure of electro liquid proportion pressure valve 131 can be according to the different numerical value that is set to of the electric current input curve Automatic continuous of drafting, and then the output hypsokinesis bearing force that makes anti-hypsokinesis oil cylinder 110 does dynamically continuous output, the input current value I changing makes electro liquid proportion pressure valve 131 produce the break-make pressure changing, and then makes hydraulic oil in anti-hypsokinesis oil cylinder 110 produce the rigidity changing.That is to say, the hydraulic efficiency pressure system of anti-squat system 100 of the present utility model is continuous control hydraulic efficiency pressure systems of one and half active variable stiffness.Anti-squat system 100 of the present utility model not only adopts control unit 300 input current value I to electro liquid proportion pressure valve 131, has realized Long-distance Control, and simple in structure and easy to maintenance, effectively raises work efficiency.
Particularly, it is for example a continuous arrival current curve I1 that the input current value I being inputted by the current input terminal of control unit 300 is set to, in the time of the jib 402 inside luffing of movable arm tower crane 10, the piston rod 112 of anti-hypsokinesis oil cylinder 110 is by A to B motion (referring again to Fig. 1), and the hydraulic oil of anti-hypsokinesis oil cylinder 110 rodless cavity 110a arrives electro liquid proportion pressure valve 131 through damping element 132.If now hydraulic fluid pressure is little, piston rod 112 continues to increase the first oil circuit 130 near the pressure of anti-hypsokinesis oil cylinder 110 ends until while equaling pressure that electro liquid proportion pressure valve 131 sets in advance by A to B motion, the valve open of electro liquid proportion pressure valve 131, the first branch road 130a connects, and that is to say that anti-hypsokinesis oil cylinder 110 rodless cavity 110a and fuel tank 120 connect.And now, it is empty that the rod chamber 110b of anti-hypsokinesis oil cylinder 110 inhales, directly supplement hydraulic oil through the second shutoff valve from fuel tank 120 by the second oil circuit 140.In the time of this mode of operation, the break-make pressure of electro liquid proportion pressure valve 131 is done continuous dynamic change with the input current value I drafting in advance, and hydraulic oil rigidity in anti-hypsokinesis oil cylinder 110 is also done continuously dynamic variation, reduce to greatest extent the unfavorable impact to jib 402.If now movable arm tower crane 10 Condition of Sudden Unloadings, jib 402 hypsokinesis rapidly, the two ends of damping element 132 can produce very large difference of pressure moment, and therefore damping element 132 can provide larger and go all out after anti-, guarantees the safety of movable arm tower crane 10.In the time of movable arm tower crane 10 outside luffing, the piston rod 112 of anti-hypsokinesis oil cylinder 110 is moved to A by B, in anti-hypsokinesis oil cylinder 110 rodless cavity 110a, inhale empty, now, electro liquid proportion pressure valve 131 is not worked, check valve 133 is opened, and hydraulic oil is flowed into the rodless cavity 110a of anti-hypsokinesis oil cylinder 110 through the second branch road 130b by fuel tank 120.The hydraulic oil of the rod chamber 110b of anti-hypsokinesis oil cylinder 110 flows back to fuel tank 120 by the second oil circuit 140 simultaneously.
2, when off working state is met strong wind weather
Fig. 3 is that the movable arm tower crane off working state of an embodiment of the present utility model is met schematic diagram when strong wind.Refer to Fig. 3, when tower machine runs into strong wind weather while work, while particularly occurring blowing to the strong wind (wind direction C as shown in Figure 3) of A cabinet frame 401 directions by jib 402, very easily there is hypsokinesis in movable arm tower crane 10, the input current value I now being inputted by the current input terminal of control unit 300 is set to a suitable larger current value I 2, for jib 402 provides one larger to go all out after anti-, can be movable arm tower crane safety control is provided.
3, when jacking state
Schematic diagram when Fig. 4 is the movable arm tower crane jacking state of an embodiment of the present utility model.Refer to Fig. 4, in the time of movable arm tower crane 10 jacking, need sling standard knot 403 introducing of jib 402 under a big-elevation α, this crosses range request smooth operation, jib 402 does not allow larger rocking, for example current value I 3 of the input current value I that now anti-squat system 100 is set in advance by the current input terminal input of control unit 300 provides a fulcrum and suitable goes all out after anti-for jib 402, now, jib 402 is under the support of anti-squat system 100 and the pullling of variable-amplitude steel wire rope, be the equal of to be fixed on movable arm tower crane 10, when actv. has ensured movable arm tower crane 10 jacking, operation can balance be carried out.
4, when test mode
When movable arm tower is confidential while carrying out anti-hypsokinesis test or other test, only need just can be obtained required going all out after preventing by for example corresponding current value I 4 of the input current value I of the current input terminal input of control unit 300, without climbing tower debugging, lower potential safety hazard, promote work efficiency.
Fig. 5 be the movable arm tower crane of an embodiment of the present utility model anti-hypsokinesis oil cylinder piston rod movement stroke with anti-after the graph of a relation of going all out.Refer to Fig. 5, dotted line ob is the stiffness variation of mechanical spring formula anti-squat system, in the time that the piston rod movement stroke of anti-hypsokinesis oil cylinder arrives maximum X, after preventing, goes all out to reach maximum F, straight line ab is the hydraulic oil stiffness variation of anti-squat system 100 of the present utility model, anti-squat system 100 can reach the requirement of going all out after maximum is prevented equally, but anti-squat system 100 is in the time rigidly connecting the jib 402 that contacts movable arm tower crane 10, the rigidity of hydraulic oil is a very small value (oa section), the rigid impact that jib 402 is produced is very little, and the break-make pressure of electro liquid proportion pressure valve 131 is done continuous dynamic change with the input current value I drafting, thereby make the hydraulic oil rigidity of anti-squat system 100 according to certain rules by little increase, reduce to greatest extent the unfavorable impact to jib 402.Therefore, anti-squat system 100 both can present general hydraulic cushion characteristic, suitably adjust input current value I size, can present again the damping characteristics of mechanical spring formula anti-squat system, but performance is better than mechanical spring formula anti-squat system, and anti-squat system 100 goes all out to have more flexibility than after traditional mechanical spring formula anti-squat system anti-, less to the local adverse effect of jib.In addition, anti-squat system 100 is compared existing hydraulic controlling type anti-squat system, and it is simple in structure, and it is convenient to safeguard, is easy to promote the use of.
The above, only embodiment of the present utility model, not the utility model is done to any pro forma restriction, although the utility model discloses as above with embodiment, but not in order to limit the utility model, any those skilled in the art, do not departing within the scope of technical solutions of the utility model, when can utilizing the technology contents of described announcement to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be not depart from technical solutions of the utility model content, any simple modification of above embodiment being done according to technical spirit of the present utility model, equivalent variations and modification, all still belong in the scope of technical solutions of the utility model.
Claims (9)
1. an anti-squat system, it comprises anti-hypsokinesis oil cylinder, fuel tank, the first oil circuit and the second oil circuit, this first oil circuit is connected between the rodless cavity and this fuel tank of this anti-hypsokinesis oil cylinder, this second oil circuit is connected between the rod chamber and this fuel tank of this anti-hypsokinesis oil cylinder, it is characterized in that, this anti-squat system also comprises electro liquid proportion pressure valve, damping element and control unit, this electro liquid proportion pressure valve is connected with this damping element and is located at this first oil circuit, this damping element is between this electro liquid proportion pressure valve and this anti-hypsokinesis oil cylinder, this control unit is electrically connected on this electro liquid proportion pressure valve.
2. anti-squat system as claimed in claim 1, it is characterized in that, this anti-squat system also comprises check valve, this first oil circuit comprises the first branch road and the second branch road in parallel, this first branch road is provided with this electro liquid proportion pressure valve and this damping element, this second branch road is provided with this check valve, and the oil inlet port of this check valve is communicated with this fuel tank, and the oil outlet of this check valve is communicated with this anti-hypsokinesis oil cylinder.
3. anti-squat system as claimed in claim 1, is characterized in that, this anti-squat system also comprises power amplifier, and this power amplifier is connected between this control unit and this electro liquid proportion pressure valve.
4. anti-squat system as claimed in claim 1, it is characterized in that, this anti-squat system also comprises the first shutoff valve and the second shutoff valve, and this first shutoff valve is located at this first oil circuit, and between this electro liquid proportion pressure valve and this anti-hypsokinesis oil cylinder, this second shutoff valve is located at this second oil circuit.
5. anti-squat system as claimed in claim 1, is characterized in that, this first oil circuit is also provided with compression indicator.
6. anti-squat system as claimed in claim 1, is characterized in that, in this rodless cavity of this anti-hypsokinesis oil cylinder, is provided with spring.
7. anti-squat system as claimed in claim 1, is characterized in that, this control unit is continuous arrival current curve to the input current value of this electro liquid proportion pressure valve input.
8. anti-squat system as claimed in claim 1, is characterized in that, this control unit is the current value of setting to the input current value of this electro liquid proportion pressure valve input.
9. a movable arm tower crane, is characterized in that, this movable arm tower crane comprises the anti-squat system described in claim 1～8 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420158315.4U CN203754313U (en) | 2014-04-02 | 2014-04-02 | Anti-back-tipping device and swing arm tower crane with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420158315.4U CN203754313U (en) | 2014-04-02 | 2014-04-02 | Anti-back-tipping device and swing arm tower crane with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203754313U true CN203754313U (en) | 2014-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420158315.4U Expired - Fee Related CN203754313U (en) | 2014-04-02 | 2014-04-02 | Anti-back-tipping device and swing arm tower crane with same |
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| Country | Link |
|---|---|
| CN (1) | CN203754313U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107986171A (en) * | 2017-12-18 | 2018-05-04 | 徐工集团工程机械股份有限公司 | A kind of variable-amplitude auxiliary arm rear defence hypsokinesis oil cylinder |
| CN115557390A (en) * | 2022-09-15 | 2023-01-03 | 中联重科股份有限公司 | Suspension arm lifting control system, tower crane and hydraulic control loop of damping oil cylinder |
-
2014
- 2014-04-02 CN CN201420158315.4U patent/CN203754313U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107986171A (en) * | 2017-12-18 | 2018-05-04 | 徐工集团工程机械股份有限公司 | A kind of variable-amplitude auxiliary arm rear defence hypsokinesis oil cylinder |
| CN115557390A (en) * | 2022-09-15 | 2023-01-03 | 中联重科股份有限公司 | Suspension arm lifting control system, tower crane and hydraulic control loop of damping oil cylinder |
| CN115557390B (en) * | 2022-09-15 | 2024-04-16 | 中联重科股份有限公司 | Boom lifting control system, tower crane and hydraulic control loop of damping cylinder |
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|---|---|---|---|
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Granted publication date: 20140806 |